The relationship between a shepherd and his sheep, as Christ describes it in John 10:3-5, illustrates the intimate connection He desires with those who follow Him. The doorkeeper opens to Him, and the sheep hear His voice; He calls His own sheep by name and leads them out, going before them so that they follow because they know His voice. They will not follow a stranger, for they do not recognize a voice unfamiliar to them. Christ uses this illustration of a physical shepherd's real relationship with his flock to teach His disciples about their relationship with Him. He is no stranger to them; He knows them, and they know Him so intimately that they recognize His voice. This principle of knowing and being known finds a striking parallel in the account of Brigadier General Theodore Roosevelt Jr. during World War II. While standing with Lieutenant General Omar Bradley one night in Tunisia as a blacked-out convoy moved slowly along the road, Roosevelt remarked that he had talked to every man in his division and that they would know his voice whether they could see him or not. He then called out hoarsely to a passing truck, asking what outfit it was, and a soldier replied immediately, identifying his unit and addressing Roosevelt by name. This demonstrated the depth of relationship Roosevelt had cultivated with his troops through sacrificial attention and personal engagement. Drawing directly from Christ's illustration in John 10, the responsibility falls on each believer to determine who has been entrusted to their care so that a similarly intimate relationship can be developed with them. This forms a key point of self-sacrificial servant leadership: such leadership comes when time and effort are sacrificed to truly know those whom one leads, just as Roosevelt sacrificed time to know his soldiers so thoroughly that his voice alone brought them reassurance and confidence, and just as Christ's sheep hear and recognize His voice because of the intimate relationship He has cultivated with them.